[MarkFL]

Follow:

AdminCP -> Styles & Templates -> Style Manager

For each style you wish to affect the change, follow:

Edit Templates

Locate the group "Postbit Templates", double-click and then open the template "postbit_legacy."

Locate the opening tag:

<div class="postbody">

And change it to read:

<div class="postbody" style="<vb:if condition="($thread['postuserid'] == $post['userid']) AND in_array($thread['forumid'], array(XX, YY, ZZ))">background: #ffeb90</vb:if>">

Replace "XX, YY, ZZ" with the actual list of forumids of the forums you want this change to affect, and you can change the background to another color, I simply used the default shade of yellow we get when we select posts for inline moderation.